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-rw-r--r--dcc.c566
1 files changed, 566 insertions, 0 deletions
diff --git a/dcc.c b/dcc.c
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+++ b/dcc.c
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+/********************************************************************\
+* BitlBee -- An IRC to other IM-networks gateway *
+* *
+* Copyright 2007 Uli Meis <a.sporto+bee@gmail.com> *
+\********************************************************************/
+
+/*
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License with
+ the Debian GNU/Linux distribution in /usr/share/common-licenses/GPL;
+ if not, write to the Free Software Foundation, Inc., 59 Temple Place,
+ Suite 330, Boston, MA 02111-1307 USA
+*/
+
+#define BITLBEE_CORE
+#include "bitlbee.h"
+#include "ft.h"
+#include "dcc.h"
+#include <netinet/tcp.h>
+#include <regex.h>
+#include "lib/ftutil.h"
+
+/*
+ * Since that might be confusing a note on naming:
+ *
+ * Generic dcc functions start with
+ *
+ * dcc_
+ *
+ * ,methods specific to DCC SEND start with
+ *
+ * dccs_
+ *
+ * . Since we can be on both ends of a DCC SEND,
+ * functions specific to one end are called
+ *
+ * dccs_send and dccs_recv
+ *
+ * ,respectively.
+ */
+
+
+/*
+ * used to generate a unique local transfer id the user
+ * can use to reject/cancel transfers
+ */
+unsigned int local_transfer_id=1;
+
+/*
+ * just for debugging the nr. of chunks we received from im-protocols and the total data
+ */
+unsigned int receivedchunks=0, receiveddata=0;
+
+void dcc_finish( file_transfer_t *file );
+void dcc_close( file_transfer_t *file );
+gboolean dccs_send_proto( gpointer data, gint fd, b_input_condition cond );
+int dccs_send_request( struct dcc_file_transfer *df, irc_user_t *iu, struct sockaddr_storage *saddr );
+gboolean dccs_recv_proto( gpointer data, gint fd, b_input_condition cond);
+gboolean dccs_recv_write_request( file_transfer_t *ft );
+gboolean dcc_progress( gpointer data, gint fd, b_input_condition cond );
+gboolean dcc_abort( dcc_file_transfer_t *df, char *reason, ... );
+
+dcc_file_transfer_t *dcc_alloc_transfer( const char *file_name, size_t file_size, struct im_connection *ic )
+{
+ file_transfer_t *file = g_new0( file_transfer_t, 1 );
+ dcc_file_transfer_t *df = file->priv = g_new0( dcc_file_transfer_t, 1 );
+
+ file->file_size = file_size;
+ file->file_name = g_strdup( file_name );
+ file->local_id = local_transfer_id++;
+ file->ic = df->ic = ic;
+ df->ft = file;
+
+ return df;
+}
+
+/* This is where the sending magic starts... */
+file_transfer_t *dccs_send_start( struct im_connection *ic, irc_user_t *iu, const char *file_name, size_t file_size )
+{
+ file_transfer_t *file;
+ dcc_file_transfer_t *df;
+ irc_t *irc = (irc_t *) ic->bee->ui_data;
+ struct sockaddr_storage saddr;
+ char *errmsg;
+ char host[HOST_NAME_MAX];
+ char port[6];
+
+ if( file_size > global.conf->ft_max_size )
+ return NULL;
+
+ df = dcc_alloc_transfer( file_name, file_size, ic );
+ file = df->ft;
+ file->write = dccs_send_write;
+
+ /* listen and request */
+
+ if( ( df->fd = ft_listen( &saddr, host, port, irc->fd, TRUE, &errmsg ) ) == -1 )
+ {
+ dcc_abort( df, "Failed to listen locally, check your ft_listen setting in bitlbee.conf: %s", errmsg );
+ return NULL;
+ }
+
+ file->status = FT_STATUS_LISTENING;
+
+ if( !dccs_send_request( df, iu, &saddr ) )
+ return NULL;
+
+ /* watch */
+ df->watch_in = b_input_add( df->fd, B_EV_IO_READ, dccs_send_proto, df );
+
+ irc->file_transfers = g_slist_prepend( irc->file_transfers, file );
+
+ df->progress_timeout = b_timeout_add( DCC_MAX_STALL * 1000, dcc_progress, df );
+
+ imcb_log( ic, "File transfer request from %s for %s (%zd kb).\n"
+ "Accept the file transfer if you'd like the file. If you don't, "
+ "issue the 'transfer reject' command.",
+ iu->nick, file_name, file_size / 1024 );
+
+ return file;
+}
+
+/* Used pretty much everywhere in the code to abort a transfer */
+gboolean dcc_abort( dcc_file_transfer_t *df, char *reason, ... )
+{
+ file_transfer_t *file = df->ft;
+ va_list params;
+ va_start( params, reason );
+ char *msg = g_strdup_vprintf( reason, params );
+ va_end( params );
+
+ file->status |= FT_STATUS_CANCELED;
+
+ if( file->canceled )
+ file->canceled( file, msg );
+
+ imcb_log( df->ic, "File %s: DCC transfer aborted: %s", file->file_name, msg );
+
+ g_free( msg );
+
+ dcc_close( df->ft );
+
+ return FALSE;
+}
+
+gboolean dcc_progress( gpointer data, gint fd, b_input_condition cond )
+{
+ struct dcc_file_transfer *df = data;
+
+ if( df->bytes_sent == df->progress_bytes_last )
+ {
+ /* no progress. cancel */
+ if( df->bytes_sent == 0 )
+ return dcc_abort( df, "Couldn't establish transfer within %d seconds", DCC_MAX_STALL );
+ else
+ return dcc_abort( df, "Transfer stalled for %d seconds at %d kb", DCC_MAX_STALL, df->bytes_sent / 1024 );
+
+ }
+
+ df->progress_bytes_last = df->bytes_sent;
+
+ return TRUE;
+}
+
+/* used extensively for socket operations */
+#define ASSERTSOCKOP(op, msg) \
+ if( (op) == -1 ) \
+ return dcc_abort( df , msg ": %s", strerror( errno ) );
+
+/* Creates the "DCC SEND" line and sends it to the server */
+int dccs_send_request( struct dcc_file_transfer *df, irc_user_t *iu, struct sockaddr_storage *saddr )
+{
+ char ipaddr[INET6_ADDRSTRLEN];
+ const void *netaddr;
+ int port;
+ char *cmd;
+
+ if( saddr->ss_family == AF_INET )
+ {
+ struct sockaddr_in *saddr_ipv4 = ( struct sockaddr_in *) saddr;
+
+ sprintf( ipaddr, "%d",
+ ntohl( saddr_ipv4->sin_addr.s_addr ) );
+ port = saddr_ipv4->sin_port;
+ }
+ else
+ {
+ struct sockaddr_in6 *saddr_ipv6 = ( struct sockaddr_in6 *) saddr;
+
+ netaddr = &saddr_ipv6->sin6_addr.s6_addr;
+ port = saddr_ipv6->sin6_port;
+
+ /*
+ * Didn't find docs about this, but it seems that's the way irssi does it
+ */
+ if( !inet_ntop( saddr->ss_family, netaddr, ipaddr, sizeof( ipaddr ) ) )
+ return dcc_abort( df, "inet_ntop failed: %s", strerror( errno ) );
+ }
+
+ port = ntohs( port );
+
+ cmd = g_strdup_printf( "\001DCC SEND %s %s %u %zu\001",
+ df->ft->file_name, ipaddr, port, df->ft->file_size );
+
+ irc_send_msg_raw( iu, "PRIVMSG", iu->irc->user->nick, cmd );
+
+ g_free( cmd );
+
+ return TRUE;
+}
+
+/*
+ * After setup, the transfer itself is handled entirely by this function.
+ * There are basically four things to handle: connect, receive, send, and error.
+ */
+gboolean dccs_send_proto( gpointer data, gint fd, b_input_condition cond )
+{
+ dcc_file_transfer_t *df = data;
+ file_transfer_t *file = df->ft;
+
+ if( ( cond & B_EV_IO_READ ) &&
+ ( file->status & FT_STATUS_LISTENING ) )
+ {
+ struct sockaddr *clt_addr;
+ socklen_t ssize = sizeof( clt_addr );
+
+ /* Connect */
+
+ ASSERTSOCKOP( df->fd = accept( fd, (struct sockaddr *) &clt_addr, &ssize ), "Accepting connection" );
+
+ closesocket( fd );
+ fd = df->fd;
+ file->status = FT_STATUS_TRANSFERRING;
+ sock_make_nonblocking( fd );
+
+ /* IM protocol callback */
+ if( file->accept )
+ file->accept( file );
+
+ /* reschedule for reading on new fd */
+ df->watch_in = b_input_add( fd, B_EV_IO_READ, dccs_send_proto, df );
+
+ return FALSE;
+ }
+
+ if( cond & B_EV_IO_READ )
+ {
+ int ret;
+
+ ASSERTSOCKOP( ret = recv( fd, ( (char*) &df->acked ) + df->acked_len,
+ sizeof( df->acked ) - df->acked_len, 0 ), "Receiving" );
+
+ if( ret == 0 )
+ return dcc_abort( df, "Remote end closed connection" );
+
+ /* How likely is it that a 32-bit integer gets split accross
+ packet boundaries? Chances are rarely 0 so let's be sure. */
+ if( ( df->acked_len = ( df->acked_len + ret ) % 4 ) > 0 )
+ return TRUE;
+
+ df->acked = ntohl( df->acked );
+
+ /* If any of this is actually happening, the receiver should buy a new IRC client */
+
+ if ( df->acked > df->bytes_sent )
+ return dcc_abort( df, "Receiver magically received more bytes than sent ( %d > %d ) (BUG at receiver?)", df->acked, df->bytes_sent );
+
+ if ( df->acked < file->bytes_transferred )
+ return dcc_abort( df, "Receiver lost bytes? ( has %d, had %d ) (BUG at receiver?)", df->acked, file->bytes_transferred );
+
+ file->bytes_transferred = df->acked;
+
+ if( file->bytes_transferred >= file->file_size ) {
+ if( df->proto_finished )
+ dcc_finish( file );
+ return FALSE;
+ }
+
+ return TRUE;
+ }
+
+ return TRUE;
+}
+
+gboolean dccs_recv_start( file_transfer_t *ft )
+{
+ dcc_file_transfer_t *df = ft->priv;
+ struct sockaddr_storage *saddr = &df->saddr;
+ int fd;
+ char ipaddr[INET6_ADDRSTRLEN];
+ socklen_t sa_len = saddr->ss_family == AF_INET ?
+ sizeof( struct sockaddr_in ) : sizeof( struct sockaddr_in6 );
+
+ if( !ft->write )
+ return dcc_abort( df, "BUG: protocol didn't register write()" );
+
+ ASSERTSOCKOP( fd = df->fd = socket( saddr->ss_family, SOCK_STREAM, 0 ), "Opening Socket" );
+
+ sock_make_nonblocking( fd );
+
+ if( ( connect( fd, (struct sockaddr *)saddr, sa_len ) == -1 ) &&
+ ( errno != EINPROGRESS ) )
+ return dcc_abort( df, "Connecting to %s:%d : %s",
+ inet_ntop( saddr->ss_family,
+ saddr->ss_family == AF_INET ?
+ ( void* ) &( ( struct sockaddr_in *) saddr )->sin_addr.s_addr :
+ ( void* ) &( ( struct sockaddr_in6 *) saddr )->sin6_addr.s6_addr,
+ ipaddr,
+ sizeof( ipaddr ) ),
+ ntohs( saddr->ss_family == AF_INET ?
+ ( ( struct sockaddr_in *) saddr )->sin_port :
+ ( ( struct sockaddr_in6 *) saddr )->sin6_port ),
+ strerror( errno ) );
+
+ ft->status = FT_STATUS_CONNECTING;
+
+ /* watch */
+ df->watch_out = b_input_add( df->fd, B_EV_IO_WRITE, dccs_recv_proto, df );
+ ft->write_request = dccs_recv_write_request;
+
+ df->progress_timeout = b_timeout_add( DCC_MAX_STALL * 1000, dcc_progress, df );
+
+ return TRUE;
+}
+
+gboolean dccs_recv_proto( gpointer data, gint fd, b_input_condition cond )
+{
+ dcc_file_transfer_t *df = data;
+ file_transfer_t *ft = df->ft;
+
+ if( ( cond & B_EV_IO_WRITE ) &&
+ ( ft->status & FT_STATUS_CONNECTING ) )
+ {
+ ft->status = FT_STATUS_TRANSFERRING;
+
+ //df->watch_in = b_input_add( df->fd, B_EV_IO_READ, dccs_recv_proto, df );
+
+ df->watch_out = 0;
+ return FALSE;
+ }
+
+ if( cond & B_EV_IO_READ )
+ {
+ int ret, done;
+
+ ASSERTSOCKOP( ret = recv( fd, ft->buffer, sizeof( ft->buffer ), 0 ), "Receiving" );
+
+ if( ret == 0 )
+ return dcc_abort( df, "Remote end closed connection" );
+
+ if( !ft->write( df->ft, ft->buffer, ret ) )
+ return FALSE;
+
+ df->bytes_sent += ret;
+
+ done = df->bytes_sent >= ft->file_size;
+
+ if( ( ( df->bytes_sent - ft->bytes_transferred ) > DCC_PACKET_SIZE ) ||
+ done )
+ {
+ guint32 ack = htonl( ft->bytes_transferred = df->bytes_sent );
+ int ackret;
+
+ ASSERTSOCKOP( ackret = send( fd, &ack, 4, 0 ), "Sending DCC ACK" );
+
+ if ( ackret != 4 )
+ return dcc_abort( df, "Error sending DCC ACK, sent %d instead of 4 bytes", ackret );
+ }
+
+ if( df->bytes_sent == ret )
+ ft->started = time( NULL );
+
+ if( done )
+ {
+ if( df->watch_out )
+ b_event_remove( df->watch_out );
+
+ if( df->proto_finished )
+ dcc_finish( ft );
+
+ df->watch_in = 0;
+ return FALSE;
+ }
+
+ df->watch_in = 0;
+ return FALSE;
+ }
+
+ return TRUE;
+}
+
+gboolean dccs_recv_write_request( file_transfer_t *ft )
+{
+ dcc_file_transfer_t *df = ft->priv;
+
+ if( df->watch_in )
+ return dcc_abort( df, "BUG: write_request() called while watching" );
+
+ df->watch_in = b_input_add( df->fd, B_EV_IO_READ, dccs_recv_proto, df );
+
+ return TRUE;
+}
+
+gboolean dccs_send_can_write( gpointer data, gint fd, b_input_condition cond )
+{
+ struct dcc_file_transfer *df = data;
+ df->watch_out = 0;
+
+ df->ft->write_request( df->ft );
+ return FALSE;
+}
+
+/*
+ * Incoming data.
+ *
+ */
+gboolean dccs_send_write( file_transfer_t *file, char *data, unsigned int data_len )
+{
+ dcc_file_transfer_t *df = file->priv;
+ int ret;
+
+ receivedchunks++; receiveddata += data_len;
+
+ if( df->watch_out )
+ return dcc_abort( df, "BUG: write() called while watching" );
+
+ ASSERTSOCKOP( ret = send( df->fd, data, data_len, 0 ), "Sending data" );
+
+ if( ret == 0 )
+ return dcc_abort( df, "Remote end closed connection" );
+
+ /* TODO: this should really not be fatal */
+ if( ret < data_len )
+ return dcc_abort( df, "send() sent %d instead of %d", ret, data_len );
+
+ if( df->bytes_sent == 0 )
+ file->started = time( NULL );
+
+ df->bytes_sent += ret;
+
+ if( df->bytes_sent < df->ft->file_size )
+ df->watch_out = b_input_add( df->fd, B_EV_IO_WRITE, dccs_send_can_write, df );
+
+ return TRUE;
+}
+
+/*
+ * Cleans up after a transfer.
+ */
+void dcc_close( file_transfer_t *file )
+{
+ dcc_file_transfer_t *df = file->priv;
+ irc_t *irc = (irc_t *) df->ic->bee->ui_data;
+
+ if( file->free )
+ file->free( file );
+
+ closesocket( df->fd );
+
+ if( df->watch_in )
+ b_event_remove( df->watch_in );
+
+ if( df->watch_out )
+ b_event_remove( df->watch_out );
+
+ if( df->progress_timeout )
+ b_event_remove( df->progress_timeout );
+
+ irc->file_transfers = g_slist_remove( irc->file_transfers, file );
+
+ g_free( df );
+ g_free( file->file_name );
+ g_free( file );
+}
+
+void dcc_finish( file_transfer_t *file )
+{
+ dcc_file_transfer_t *df = file->priv;
+ time_t diff = time( NULL ) - file->started ? : 1;
+
+ file->status |= FT_STATUS_FINISHED;
+
+ if( file->finished )
+ file->finished( file );
+
+ imcb_log( df->ic, "File %s transferred successfully at %d kb/s!" , file->file_name, (int) ( file->bytes_transferred / 1024 / diff ) );
+ dcc_close( file );
+}
+
+/*
+ * DCC SEND <filename> <IP> <port> <filesize>
+ *
+ * filename can be in "" or not. If it is, " can probably be escaped...
+ * IP can be an unsigned int (IPV4) or something else (IPV6)
+ *
+ */
+file_transfer_t *dcc_request( struct im_connection *ic, char* const* ctcp )
+{
+ irc_t *irc = (irc_t *) ic->bee->ui_data;
+ file_transfer_t *ft;
+ dcc_file_transfer_t *df;
+ int gret;
+ size_t filesize;
+
+ if( ctcp[5] != NULL &&
+ sscanf( ctcp[4], "%zd", &filesize ) == 1 && /* Just int. validation. */
+ sscanf( ctcp[5], "%zd", &filesize ) == 1 )
+ {
+ char *filename, *host, *port;
+ struct addrinfo hints, *rp;
+
+ filename = ctcp[2];
+
+ host = ctcp[3];
+ while( *host && isdigit( *host ) ) host++; /* Just digits? */
+ if( *host == '\0' )
+ {
+ struct in_addr ipaddr = { .s_addr = htonl( atoll( ctcp[3] ) ) };
+ host = inet_ntoa( ipaddr );
+ } else
+ {
+ /* Contains non-numbers, hopefully an IPV6 address */
+ host = ctcp[3];
+ }
+
+ port = ctcp[4];
+ filesize = atoll( ctcp[5] );
+
+ memset( &hints, 0, sizeof ( struct addrinfo ) );
+ hints.ai_socktype = SOCK_STREAM;
+ hints.ai_flags = AI_NUMERICSERV;
+
+ if ( ( gret = getaddrinfo( host, port, &hints, &rp ) ) )
+ {
+ imcb_log( ic, "DCC: getaddrinfo() failed with %s "
+ "when parsing incoming 'DCC SEND': "
+ "host %s, port %s",
+ gai_strerror( gret ), host, port );
+ return NULL;
+ }
+
+ df = dcc_alloc_transfer( filename, filesize, ic );
+ ft = df->ft;
+ ft->sending = TRUE;
+ memcpy( &df->saddr, rp->ai_addr, rp->ai_addrlen );
+
+ freeaddrinfo( rp );
+
+ irc->file_transfers = g_slist_prepend( irc->file_transfers, ft );
+
+ return ft;
+ }
+ else
+ imcb_log( ic, "DCC: couldnt parse `DCC SEND' line" );
+
+ return NULL;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2025-10-31 12:03:41 +0000